How to make the inline widget background transparent?

 Hi,

I have issues integrating the Calendly inline widget on my website.
The iframe has a white background messing with my website style.
Is it possible to get rid of the white color and make it transparent?

It seems possible looking at other website integrating the Calendly widgets like this demo https://www.calendly-embed.com/embed-options#inline.

But I can’t figure out how to do it.

Thanks for your help!